Spoke to my mate. His one is a Rhino and uses the phone network for location. I don't think that would be as reliable/accurate as GPS.
However, it does mean that it works inside your garage, in car parks etc.

No, the tracking itself is all done by you, so there is no ongoing costs except for the simcard which could cost you as little as $10/month
You put a sim card in the unit (you can just use a cheap pre-paid if you like) and you can talk to it via your mobile.

You can send SMS to it and it will reply with it's current GPS co-ordinates that can then be entered into google maps or other software. Some will even reply with a street address.

You can also send SMS to it to cut the fuel/ignition etc.
One of the ones I was looking at even turns on the hazard lights when it cuts the engine so that other drives are alerted that the car is stopping.

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